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cta-observatory / ctapipe_io_lst

ctapipe IO plugin for LST prototype data

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Flatfield tagging misses some flatfield events

moralejo opened this issue · comments

commented

This can be seen in page 6 of https://www.lst1.iac.es/datacheck/dl1/v0.7.1/20201117/datacheck_dl1_LST-1.Run02912.pdf: there is a peak in the charge & intensity spectra of cosmics, which corresponds to flatfield events

This was not the case with lstchain's older (0.6.3) tagging:
https://www.lst1.iac.es/datacheck/dl1/v0.6.3_v05/20201117/datacheck_dl1_LST-1.Run02912.pdf

commented

Hi @moralejo,
this due to a different tagging strategy adopted in the new source. I hope it is solved with PR 681

By the way, since some weeks, also the calibox trigger is active, so we should add the possibility to use also that tagging (preliminary studies show that is marginally less efficient than the standard one) for the FF selection with filter 52. But this will be useful overall for the low intensity runs in the filter scans. I will propose a PR in ctapipe_io_lst (this does not concerns the coming production)

commented

Hi, yes, I think the changes in the LSTEventSource settings implemented in lstchain fixed the issue (which showed up only on one of the reprocessed nights). As for using the event tagging from TIB, I see no urgency. Until the system is 100% reliable I would not switch to using it for the FF tagging.